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vigil
🚦 Microservices Status Page. Monitors a distributed infrastructure and sends alerts (Slack, SMS, etc.). (by valeriansaliou)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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vigil-local
🕯 Vigil Local daemon. Used as a slave service to monitor hosts behind a firewall and report their status to Vigil.
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thanos
Highly available Prometheus setup with long term storage capabilities. A CNCF Incubating project.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
If you don't have the budget or have a decent size team, go with Prometheus and Grafana. Be mindful to do the research, the storage for Prometheus needs to be well designed for scalability. We wanted at some point to implement this Thanos but we didn't have the bandwidth to do so.
If you want more of a 1:1, this is what I found when I was looking for an alternative a while back. https://github.com/TwiN/gatus